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25I-NBOH
Chemical compound
Chemical compound
25I-NBOH (NBOH-2C-I, Cimbi-27, 2C-I-NBOH) is a derivative of the phenethylamine-derived hallucinogen 2C-I that was discovered in 2006 by a team at Purdue University. It is a known metabolite of 25I-NBOMe and has also been encountered as a novel designer drug.
Use and effects
The dose range of 25I-NBOH is 300 to 1,000μg, with an estimated typical dose of 700μg. The route of administration is sublingual or buccal.
Interactions
Pharmacology
Pharmacodynamics
| Target | Affinity (Ki, nM) |
|---|---|
| [5-HT1A](5-ht1a-receptor) | 2,220–10,000 (Ki) |
| 37,000 () | |
| 74% () | |
| [5-HT1B](5-ht1b-receptor) | 2,446 |
| [5-HT1D](5-ht1d-receptor) | 1,277 |
| [5-HT1E](5-ht1e-receptor) | 10,000 |
| [5-HT1F](5-ht1f-receptor) | ND |
| [5-HT2A](5-ht2a-receptor) | 0.061–1.12 (Ki) |
| 0.074–1.52 (EC50) | |
| 86–136% (Emax) | |
| [5-HT2B](5-ht2b-receptor) | 1.9–2.8 (Ki) |
| 111 (EC50) | |
| 21% (Emax) | |
| [5-HT2C](5-ht2c-receptor) | 0.13–1.4 (Ki) |
| 2.4–32 (EC50) | |
| 94–101% (Emax) | |
| [5-HT3](5-ht3-receptor) | 10,000 |
| [5-HT4](5-ht4-receptor) | ND |
| [5-HT5A](5-ht5a-receptor) | 965 |
| [5-HT6](5-ht6-receptor) | 111 |
| [5-HT7](5-ht7-receptor) | 3,472 |
| α1A | 3,924 |
| α1B | 10,000 |
| α1D | 10,000 |
| α2A | 2,257 |
| α2B | 3,043 |
| α2C | 1,003 |
| β1 | 1,088 |
| β2, β3 | ND |
| D1 | ND |
| D2 | 10,000 |
| D3 | 678 |
| D4 | 844 |
| D5 | 10,000 |
| H1, H2 | ND |
| H3 | 10,000 |
| H4 | ND |
| M1–M5 | 10,000 |
| I1 | ND |
| σ1 | 160 |
| σ2 | 264 |
| 47 (Ki) | |
| 1,330–23,400 (EC50) | |
| 16–55% (Emax) | |
| ND | |
| 328 | |
| ND | |
| 1,155–1,220 (Ki) | |
| 1,720 () | |
| Inactive (EC50) | |
| 4,060 (Ki) | |
| 629 (IC50) | |
| Inactive (EC50) | |
| 8,500 (Ki) | |
| 30,700 (IC50) | |
| Inactive (EC50) | |
| **Notes:** The smaller the value, the more avidly the drug binds to the site. All proteins are human unless otherwise specified. **Refs:** | |
25I-NBOH acts as a potent agonist of the 5-HT2A receptor, with a Ki of 0.061 nM at the human 5-HT2A receptor, similar to the better-known compound 25I-NBOMe, making it some twelve times the potency of 2C-I itself.
Although in vitro tests show this compound acts as an agonist, animal studies to confirm these findings have not been reported. While the N-benzyl derivatives of 2C-I had significantly increased binding to 5-HT2A receptor fragments, compared to 2C-I, the N-benzyl derivatives of DOI, such as DOI-NBOMe, were less active compared to DOI.
25I-NBOH is notable in having been found to be one of the most selective agonists of the serotonin 5-HT2A receptor known, with an EC50 value of 0.074nM and with more than 400-fold selectivity over the serotonin 5-HT2C receptor. However, in another study, it only had about 6-fold selectivity for the serotonin 5-HT2A receptor over the serotonin 5-HT2C receptor.
25I-NBOH produces the head-twitch response, a behavioral proxy of psychedelic-like effects, in rodents.
Chemistry
Analysis
25I-NBOH is a labile molecule which fragments into 2C-I when analyzed by routine gas chromatography (GC) methods. A specific method for reliable identification of 25I-NBOH using GC/MS has been reported, allowing forensic forces worldwide to correctly identify this compound.
Analogues
Analogues of 25I-NBOH include 2C-I, DOI, 25B-NBOH, 25C-NBOH, 25I-NBOMe, 25I-NB3OMe, 25I-NBMD, 25I-NB4OMe, 25I-NB34MD, 25I-NBF, and DOI-NBOMe, among others.
History
25I-NBOH was first described in the scientific literature by Ralm Heim and colleagues by 2000.
Society and culture
Legal status
Canada
25I-NBOH is a controlled substance in Canada under phenethylamine blanket-ban language.
Sweden
The Riksdag added 25I-NBOH to Narcotic Drugs Punishments Act under Swedish schedule I ("substances, plant materials and fungi which normally do not have medical use") as of August 18, 2015, published by Medical Products Agency MPA) in regulation HSLF-FS 2015:12 listed as "25I-NBOH" and "2-([2-(4-jodo-2,5-dimetoxifenyl)etylamino]metyl)fenol".
United Kingdom
United States
25I-NBOH is not an explicitly controlled substance in the United States. However, it could be considered a controlled substance under the Federal Analogue Act if intended for human consumption.
References
References
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- (January 2023). "25X-NBOMe compounds - chemistry, pharmacology and toxicology. A comprehensive review". Critical Reviews in Toxicology.
- (2017). "25I-NBOH: a new potent serotonin 5-HT2A receptor agonist identified in blotter paper seizures in Brazil". Forensic Toxicology.
- (December 2006). "Molecular interaction of serotonin 5-HT2A receptor residues Phe339(6.51) and Phe340(6.52) with superpotent N-benzyl phenethylamine agonists". Molecular Pharmacology.
- (2007). "Towards a biophysical understanding of hallucinogen action". Purdue University.
- Ettrup, A. (2010). Serotonin receptor studies in the pig brain: pharmacological intervention and positron emission tomography tracer development (Doctoral dissertation, Faculty of Health Sciences, University of Copenhagen). https://research.regionh.dk/en/publications/serotonin-receptor-studies-in-the-pig-brain-pharmacological-inter
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- (2012). "Structure–activity relationships of serotonin 5-HT 2A agonists". Wiley Interdisciplinary Reviews: Membrane Transport and Signaling.
- (19 March 2014). "Synthesis and Structure–Activity Relationships of N -Benzyl Phenethylamines as 5-HT 2A/2C Agonists". ACS Chemical Neuroscience.
- (2018). "Chemistry and Structure-Activity Relationships of Psychedelics". Current Topics in Behavioral Neurosciences.
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- (October 2020). "In vitro structure-activity relationship determination of 30 psychedelic new psychoactive substances by means of β-arrestin 2 recruitment to the serotonin 2A receptor". Archives of Toxicology.
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- (December 2006). "Molecular interaction of serotonin 5-HT2A receptor residues Phe339(6.51) and Phe340(6.52) with superpotent N-benzyl phenethylamine agonists". Molecular Pharmacology.
- (May 2020). "Correlation between the potency of hallucinogens in the mouse head-twitch response assay and their behavioral and subjective effects in other species". Neuropharmacology.
- (2017). "2A receptor agonist identified in blotter paper seizures in Brazil". Forensic Toxicology.
- (2017). "Preventing misidentification of 25I-NBOH as 2C-I on routine GC–MS analyses". Forensic Toxicology.
- (March 2000). "39. Novel Extremely Potent Partial 5-HT2A-Receptor Agonists: Successful Application of a New Structure-Activity Concept". Arch. Pharm. Pharm. Med. Chem.
- (2000). "B 1.11. N-Benzylated phenylethanamines are highly potent partial agonists at 5-HT2A receptors". Arch. Pharm. Pharm. Med. Chem.
- (25 March 2003). "Synthese und Pharmakologie potenter 5-HT2A-Rezeptoragonisten mit N-2-Methoxybenzyl-Partialstruktur. Entwicklung eines neuen Struktur-Wirkungskonzepts.". diss.fu-berlin.de.
- "Controlled Drugs and Substances Act".
- "Gemensamma författningssamlingen avseende hälso- och sjukvård, socialtjänst, läkeme del, folkhälsa m.m.". Lakemedelsverket.
- (January 2026). "Orange Book: List of Controlled Substances and Regulated Chemicals (January 2026)". U.S. [[Department of Justice]]: [[Drug Enforcement Administration]] (DEA): Diversion Control Division.
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